The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 2004
Filed:
Aug. 10, 2001
Jean-Marie Pierret, Paris, FR;
Damien Pensec, Nantes, FR;
Valeo Equipements Electriques Moteur, Creteil, FR;
Abstract
A motor vehicle alternator includes a regulator for varying excitation as a function of a reference variable, together with a conversion circuit for varying the reference variable (such as a voltage) according to a PWM signal. It includes, in combination: an internal clock with a controlled variable period; a difference circuit which produces a difference signal between the period of the PWM signal and that of a signal from the clock; a control circuit which governs the internal clock in response to the difference signal in such a way as to equalize the periods of the internal clock signal and the PWM signal; and a conversion circuit which comprises a counter paced by the clock and active while the PWM signal is at a given logic level, together with a D/A converter for converting the count from the counter into a voltage from which the regulator reference voltage is obtained.